检索结果-南通市图书馆

Co-axial depth sensor with an extended depth range for AR/VR applications

在线全文

学校读者我要写书评

暂无评论

Virtual Reality & Intelligent Hardware 2020年第1期2卷 1-11页

作者： Mohan XU hong hua 3D Visualization and Imaging Systems Laboratory College of Optical SciencesUniversity of Arizona1630 East University BoulevardTucsonAZ 85721USA

Background Depth sensor is an essential element in virtual and augmented reality devices to digitalize users'environment in real *** current popular technologies include the stereo,structured light,and Time-of-Flight(ToF).The stereo and structured light method require a baseline separation between multiple sensors for depth sensing,and both suffer from a limited measurement *** ToF depth sensors have the largest depth range but the lowest depth map *** overcome these problems,we propose a co-axial depth map sensor which is potentially more compact and cost-effective than conventional structured light depth ***,it can extend the depth range while maintaining a high depth map ***,it provides a high-resolution 2 D image along with the 3 D depth *** This depth sensor is constructed with a projection path and an imaging *** two paths are combined by a beamsplitter for a co-axial *** the projection path,a cylindrical lens is inserted to add extra power in one direction which creates an astigmatic *** depth measurement,the astigmatic pattern is projected onto the test scene,and then the depth information can be calculated from the contrast change of the reflected pattern image in two orthogonal *** extend the depth measurement range,we use an electronically focus tunable lens at the system stop and tune the power to implement an extended depth range without compromising depth *** In the depth measurement simulation,we project a resolution target onto a white screen which is moving along the optical axis and then tune the focus tunable lens power for three depth measurement subranges,namely,near,middle and *** each sub-range,as the test screen moves away from the depth sensor,the horizontal contrast keeps increasing while the vertical contrast keeps decreasing in the reflected ***,the depth information can be obtained by computing the contrast ratio between fe

关键词： Depth map sensor 3 D camera Controlled aberration

Theoretical and experimental research on heat transfer performance of the semi-open heat pipe

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第3期9卷 410-415页

作者： hua ZHU Bo ZhuaN Jin-jun TAN Rong-hua hong Institute of Thermal Science and Power Systems Zhejiang University Hangzhou 310027 China

This paper focuses on the heat transfer performance of semi-open heat pipe which is a new type of heat pipe. After analyzing its condensation heat transfer mechanisms theoretically, several semi-open heat pipes in different length ratios and upper hole diameters are studied experimentally and compared with the same dimensions closed heat pipes. Experimental results show that the heat transfer performance of semi-open heat pipe becomes better by increasing heat transfer rate. At the first transitional point, the heat transfer performance of semi-open heat pipe approaches the level of the closed heat pipe. It is suitable to choose upper small hole about 1 mm in diameter and length ratio larger than 0.6 for the semi-open heat pipe.

关键词： Semi-open heat pipe Heat transfer performance Closed heat pipe First transitional point

Algebraic Bethe Ansatz for the Osp(1|2) Model with Reflecting Boundaries

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2001年第7期36卷 19-24页

作者： YUE Rui-hong XIONG Chuan-hua Institute of Modern Physics Northwest University Xi''an 710069 China Institute of Modern Physics Northwest University Xi''an 710069 China

In the framework of graded quantum inverse scattering method, we obtain the eigenvalues and the eigenvectors of the Osp(l|2) model with reflecting boundary conditions in FBF background. The corresponding Bathe ansatz ... 详细信息

关键词： Osp(1|2), algebraic Bethe ansatz, reflection equation

Numerical analysis of added mass and damping of elastic hydrofoils

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2020年第5期32卷 1009-1023页

作者： Jia-sheng Li Ye-gao Qu hong-xing hua School of Naval Architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074China Hubei Provincial Engineering Research Center of Data Techniques and Supporting Software for Ships(DTSSS) Wuhan 430074China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China

A numerical model is proposed for analyzing the effects of added mass and damping on the dynamic behaviors of *** coupled fluid-structure interactions(FSIs)of hydrofoils are analyzed by using the 3-D panel method for the fluid and the finite element method for the *** added mass and damping matrices due to the external fluid of the hydrofoil are asymmetric and computational *** computational inefficiencies associated with these asymmetric matrices are overcome by using a modal reduction technique,in which the first several wet mode vectors of the hydrofoil are employed in the analysis of the FSI *** discretized system of equations of motion for the hydrofoil are solved using the Wilson-6 *** present methods are validated by comparing the computed results with those obtained from the finite element *** is found that the stationary flow is sufficient for determining the wet modes of the hydrofoil under the condition of single-phase potential flow and without phase *** the case of relatively large inflow velocity,the added damping of the fluid can significantly affect the structural responses of the hydrofoil.

关键词： Fluid-structure interaction(FSI) hydroelastic response hydrofoil added mass added damping

Laser manufacturing of spatial resolution approaching quantum limit

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第3期13卷 421-428页

作者： Xiao-Jie Wang hong-hua Fang Zhen-Ze Li Dan Wang hong-Bo Sun State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin University2699 Qianjin StreetChangchun 130012China

Atomic and close-to-atom scale manufacturing is a promising avenue toward single-photon emitters,single-electron transistors,single-atom memory,and quantum-bit devices for future communication,computation,and sensing *** manufacturing is outstanding to this end for ease of beam manipulation,batch production,and no requirement for *** is,however,suffering from optical diffraction ***,we report a spatial resolution improved to the quantum limit by exploiting a threshold tracing and lock-in method,whereby the two-order gap between atomic point defect complexes and optical diffraction limit is surpassed,and a feature size of<5 nm is *** underlying physics is that the uncertainty of local atom thermal motion dominates electron excitation,rather than the power density slope of the incident *** show that the colour centre yield in hexagonal boron nitride is transformed from stochastic to deterministic,and the emission from individual sites becomes polychromatic to *** a result,single colour centres in the regular array are deterministically created with a unity yield and high positional accuracy,serving as a step forward for integrated quantum technological applications.

关键词： quantum limit resolution

Deformation behavior of fine-grained 5083 Al alloy at elevated temperature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2009年第S02期19卷 307-311页

作者： ZHANG Kai-feng YAN hong-hua School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

The microstructure evolution of the fine-grained 5083 Al alloy was investigated in annealing temperature range of 150−300℃.Then the effects of the different annealed microstructures on high-temperature deformation behavior were further *** results indicate that the initial recrystallization temperature is about 200℃.By tensile tests at 380−570℃and in strain rate range of 4.17×10^(−4)−1.0×10^(−2) s^(−1),the optimum superplastic parameters are obtained as follows:the annealed temperature 250℃,the tensile temperature 550℃and the strain rate 4.17×10^(−4) s^(−1).With the aid of scanning electronic microscopy(SEM),the fractography of the alloy after the superplastic deformation was *** results reveal that intergranular cavities with fine size and homogeneous distribution are beneficial to superplastic deformation.

关键词： fine-grained 5083 Al alloy annealing superplastic deformation

Analytic Study of a Bose-Einstein Condensate in Waveguide with an Obstacle Potential

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第7期50卷 89-94页

作者： SONG Jian-Wen HAI Wen-hua Zhong hong-hua LUO Xiao-Bing Department of Physics Hunan Normal University Changsha 410081 China Institute of Physics the Chinese Academy of Sciences Beijing 100080 China

We investigate the exact solutions of one-dimensional (1D) time-independent Gross-Pitaevskii equation(GPE),which governs a Bose-Einstein condensate (BEC) in the magnetic waveguide with a square-Sech *** bound state and transmission state are found and the corresponding spatial configurations and transport propertiesof BEC are *** is shown that the well-known absolute transmission of the linear system can occur in theconsidered nonlinear system.

关键词： square-Sech potential exact solutions bound state transmission state absolute transmission

Brucea javanica oil emulsion improves the effect of radiotherapy on esophageal cancer cells by inhibiting cyclin D1-CDK4/6 axis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2019年第20期25卷 2463-2472页

作者： Zhong-hua Qiu Wei-Wei Zhang hong-hua Zhang Gui-hua Jiao Department of Neurology Liangshan County People's HospitalJining272600Shandong ProvinceChina Department of Neurology Liangshan County People's HospitalJining272600Shandong ProvinceChina

BACKGROUND Esophageal cancer is one of the most common cancers around the world, and it has high incidence and mortality rates. The conventional therapy for esophageal cancer is radiotherapy, although its effect is highly limited by the resistance of esophageal cancer cells. Thus, strong radiosensitizers can be very crucial during radiotherapy against esophageal cancer. Brucea javanica oil emulsion (BJOE) is a widely used drug against various cancers, such as liver, colon, and ovarian cancer. However, its anti-cancer effect and mechanism and the use of BJOE as a radiosensitizer have not been explored in esophageal cancer. AIM To evaluate the anti-cancer effect and mechanism of BJOE and explore the potential use of BJOE as a radiosensitizer during radiotherapy. METHODS The inhibitory effect of BJOE and its enhancement function with radiation on cell viability were examined with the calculated half-maximal effective concentration and half-maximal lethal concentration. The influence of BJOE on cell migration and invasion were measured with EC109 and JAR cells by wound-healing and transwell assay. Clonogenesis and apoptotic rate, which was measured by Hoechst staining, were investigated to confirm its enhancement function with radiation. To investigate the molecular pathway underlying the effect of BJOE, the expressions of several apoptosis- and cycle-related proteins was detected by western *** lines more than normal cell lines, and it markedly reduced migration and invasion in esophageal cancer cells (EC109 and JAR). Moreover, it promoted cell apoptosis and enhanced the effect of radiotherapy against esophageal cancerous cells. In the viability test, the values of half-maximal effective concentration and half-maximal lethal concentration were reduced. Compared to the control, only around 1/5 colonies formed when using BJOE and radiation together in the clonogenic assay. The apoptotic rate in EC109 was obviously promoted when BJOE was added during radiotherap

关键词： Esophageal cancer Brucea javanica oil emulsion Radiosensitizer Apoptosis Cyclin D1-CDK4/6 axis

Brazed joints of CBN grains and AISI 1045 steel with AgCuTi-TiC mixed powder as filler materials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2011年第6期18卷 717-724页

作者： Wen-feng Ding Jiu-hua Xu Zhen-zhen Chen hong-hua Su Yu-can Fu College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

The brazing process of cubic boron nitride （CBN） grains and AISI 1045 steel with AgCuTi-TiC mixed powder as a filler material was carried *** joining strength and the interfacial microstructure were *** experimental results indicate that the spreading of the molten filler material on AISI 1045 steel is decreased with the increase of TiC content.A good interface is formed between the TiC particulates and AgCuTi alloy through the wetting *** the case of AgCuTi＋16wt% TiC,the strength of the brazed steel-to-steel joints reached the highest value of 95MPa dependent upon the reinforcement effect of TiC particles within the filler *** resultants of TiB2,TiB,and TiN are produced at the interface of the CBN grains and the AgCuTi-TiC filler layer by virtue of the interdiffusion of B,N,and Ti atoms.

关键词： grinding wheels cubic boron nitride brazing filler metals shear strength interfaces